问题

Have you realized the difficulty we have ____ the problem?
A:worked out
B:to work out
C:work out
D:working out
B:to work out
C:work out
D:working out
正确答案是:
同类题型
We _______ play on this road. There is too much traffic.
Many accidents _________ by careless drivers last year .
Nobody could stop our English teacher_____working, though she doesn’t feel well. [ ]
I’m proud ______ our great country.[ ]
Jay’s songs sound ________. Don’t miss his ________ show.—Yes. He is my favorite singer.